That's the kind of insight you can't get except from an eyewitness, people. But that's not even what we're reporting on regarding K-well-Fed today.

Kevin Federline and Victoria Prince? Money? Please.

Kevin may be living large on a multiple levels, but that doesn't mean he's a good tipper. Despite getting comped two bottles of Grey Goose, Federline stiffed all the servers at the club at the end of the night for no apparent reason.

But at least he had fun: "At one point, Kevin got on stage with the Sin City Sinners and hyped the crowd, bragging that he was intoxicated," a source says.

Kevin Federline, Victoria Prince and their entourage left around 3 a.m. to go party elsewhere, presumably without paying anything. That's the good life.